Another way of looking at this is to ask the question "What would have happened if the accident had never taken place"; that is to say, suppose the pilot had resolved whatever issues he faced over Alderney and gone on to land uneventfully at Cardiff.
I'd suggest the answer is a big fat nothing.
And therein lies the heart of the problem; lack of effective oversight and accountability. Had the pilot believed that he would likely have had to explain his actions on landing at Cardiff, he just might have thought twice about taking off in the first place.
It's human nature for a minority of folks to bend the rules if they think there's little chance of getting found out.
If we want to make real improvements in safety, we need to take more effective enforcement action against those who break the rules and don't crash.